Electronic device and control method of electronic device
AssigneeSeiko Epson Corporation
InventorKazumi MATSUMOTO
Life of this patent
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Abstract
A processor outputs selected frequency information from standard radio wave frequency information, GPS frequency information, LPWA frequency information, and mobile phone frequency information, and controls an oscillation circuit such that a frequency of a clock signal is close to a reference frequency. Accordingly, even in a case where an environment of an electronic device changes, it is possible to improve accuracy of an internal time by correcting a frequency of the clock signal by using a radio wave appropriate for the environment after the change.
Claims21
An electronic device comprising:
- a first receiver that receives a first radio wave and outputs first frequency information based on a carrier frequency of the first radio wave;
- a second receiver that receives a second radio wave and outputs second frequency information based on a carrier frequency of the second radio wave;
- an oscillation circuit that generates a clock signal used for measuring an internal time;
- and
- a processor connected to the first receiver, the second receiver, and the oscillation circuit, the processor being configured to:
- determine a reception environment, of the first radio wave and the second radio wave;
- and
- control the oscillation circuit such that the frequency of the clock signal is close to a reference frequency determined based on any of the first frequency information and the second frequency information, based on a determination result of the reception environment.
A control method of an electronic device including a first receiver that receives a first radio wave and outputs first frequency information based on a carrier frequency of the first radio wave, a second receiver that receives a second radio wave and outputs second frequency information based on a carrier frequency of the second radio wave, and an oscillation circuit that generates a clock signal used for measuring an internal time, the method comprising:
- determining, using the electronic device, a reception environment of the first radio wave and the second radio wave;
- outputting, using the electronic device, any of the first frequency information and the second frequency information as selected frequency information based on a determination result of determining the reception environment;
- and
- controlling, using the electronic device, the oscillation circuit such that the frequency of the clock signal is close to a reference frequency determined in accordance with the selected frequency information.
An electronic device comprising:
- a global positioning system (GPS) receiver that receives a GPS radio wave and outputs first frequency information based on a carrier frequency of the GPS radio wave;
- a second receiver that receives a second radio wave other than the GPS radio wave and outputs second frequency information based on a carrier frequency of the second radio wave;
- an oscillation circuit that generates a clock signal used for measuring an internal time;
- and
- a processor connected to the GPS receiver, the second receiver, and the oscillation circuit, the processor being configured to:
- determine whether the electronic device is indoors or outdoors based on the GPS radio wave;
- when the electronic device is outdoors, set a reference frequency based on the first frequency information;
- when the electronic device is indoors, set the reference frequency based on the second frequency information;
- and
- control the oscillation circuit such that the frequency of the clock signal is close to the reference frequency;
- and
- a display connected to the processor that displays a time based on the internal time.
Dependencies are inferred from the claim text.